The Icom service manual for the IC-A20MKII VHF Air Band Transceiver provides detailed instructions on setup, operation, and troubleshooting, including specifications, circuit descriptions, and adjustment procedures. It emphasizes safety precautions, such as avoiding exposure to liquids and ensuring correct power connections, and offers guidance on ordering replacement parts and performing repairs.
Overview
This service manual provides detailed service information for the IC-A20MKII VHF Air Band Transceiver. It includes specifications, circuit descriptions, mechanical parts and disassembly instructions, parts lists, adjustment procedures, board layouts, block diagrams, and voltage diagrams. The manual covers different versions of the transceiver for the United Kingdom, France, Europe, and Germany.
Specifications
- Frequency coverage Transmit Communications 118.000~136.975 MHz
- Navigation 108.000~117.975 MHz
- Receive Communications 118.000~136.975 MHz
- Mode AM (6KOOA3E)
- Number of memory channels 20
- Tuning step 25 kHz
- Frequency stability +0.002 % (~10 °C~+50 °C)
- Antenna impedance 50 O (unbalanced)
- Power supply requirement 12~15 V DC (Negative ground)
- Usable temperature range —10 °C~+50°C
- Current drain (at 13.2 V DC) Transmit High 900 mA
- Low 600 mA
- Receive Max. audio output 400 mA
- Squelched 55 mA
- Dimensions (with CM-7G) 65 (W) x 198 (H) x 35 (D) mm; 2.6 (W)* 7.8 (H) x 1.4 (D) in
- Weight (with CM-7G) 640 g (1.4 Ib)
- Output power (at 13.2 V DC) PEP power Carrier power
- High 5.0 W 15W
- Low 1.6W 500 mW
- Modulation system Low level modulation
- Microphone impedance 1kO
- Spurious emissions —50 dB
- Receive system Double-conversion superheterodyne
- Sensitivity 1.0 pV for 6 dB S/N (with 1 kHz, 30 % modulation)
- Squeich sensitivity (threshold) 0.25 pV
- Intermediate frequencies 1st 35.8 MHz
- 2nd 455 kHz
- Audio output power 600 mW with an 8 O load
- Audio output impedance 8Q
- Spurious response rejection —60 dB
- Noise and hum 25 dB
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 13.5 MB)
Icom IC-A20MKII Service Manual PDF (13.5 MB) aids technicians in troubleshooting, calibrating, and repairing the IC-A20MKII model.
- Brand: Icom-ic-a20mkii-service
- Model: MANUAL
- Type: Service manual
- File size: 13.5 MB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download MANUAL service manual (PDF)
Icom IC-A20MKII Service Manual Overview
The Icom IC-A20MKII is a professional aviation handheld transceiver designed for reliable communication in demanding environments. This service manual provides detailed instructions for maintenance, repair, and troubleshooting of the IC-A20MKII model, ensuring optimal performance and longevity of the device. Ideal for technicians and service personnel, the manual covers all aspects of the radio’s internal components and operational functions.
Main Features and Specifications
- Frequency Range: 118.000 MHz to 136.975 MHz (VHF Airband)
- Power Output: 5 Watts (High), 1 Watt (Low)
- Channel Capacity: 200 memory channels
- Display: Backlit LCD with channel and frequency indicators
- Battery: Rechargeable NiMH battery pack with long operating time
- Robust and compact design suitable for aviation use
- Built-in noise limiter and squelch control for clear audio reception
- Emergency channel access and priority scan functions
Basic Usage and Operation Tips
To operate the IC-A20MKII, ensure the battery is fully charged before use. Turn the radio on by rotating the volume knob, then select the desired frequency or memory channel using the channel selector. Use the push-to-talk (PTT) button to transmit your message. Adjust the squelch control to minimize background noise for clearer reception. Regularly check the antenna connection and battery status indicator to maintain optimal communication quality.
Troubleshooting and Maintenance Notes
If the radio fails to power on, verify the battery charge and ensure it is properly seated. For audio issues, check the speaker and microphone connections. Refer to the manual’s circuit diagrams and parts list for component-level troubleshooting. Clean the exterior and connectors regularly with a soft, dry cloth to prevent dust buildup. Avoid exposing the device to extreme temperatures or moisture to prevent damage.
Safety Reminder
Always follow aviation communication protocols and regulations when using the IC-A20MKII. Do not attempt repairs beyond the scope of this manual unless qualified, as improper servicing may cause device malfunction or safety hazards. Keep the device away from water and excessive heat, and use only manufacturer-approved batteries and accessories to ensure safe operation.